Profile picture of MD. Jahidul Haque Junayer

MD. Jahidul Haque Junayer

Backend Heavy Fullstack • Scraper & Automation Expert

Scrapers, backends, and automation that don't flake.

I design and deliver practical systems - web scrapers, automation tools, APIs, and robust full‑stack applications - built to keep working. IEEE-published researcher in IoT systems. Clean code, docs, and handover included.

Work with me See selected work

Selected work

Projects that show reliability and utility. View client work or see my services.

FreeProxy4u

Daily updated proxy service offering HTTP and SOCKS4/5 lists for anonymity and testing.

  • Proxy aggregation
  • Automation
  • HTTP/SOCKS4/5
  • Regular refresh & dedupe
  • JSON / plaintext outputs
Repo

TeleDoc

Appointment booking system for clinics with scheduling and basic admin features.

  • PHP
  • MySQL
  • AJAX
  • CRUD + auth
  • Efficient appointment management
Repo

Anime‑Sync

JavaScript utility for synchronizing anime content across sources.

  • JavaScript
  • Automation
  • Actively maintained
Repo

BMDC‑API

Simple API to check doctor registration numbers for quick verification.

  • REST API
  • Verification
  • Lightweight endpoints
Repo

Samsung Chatbot API

AI-powered FastAPI backend with RAG chatbot for Samsung device intelligence, featuring ETL pipelines, vector search, and multi-agent workflows.

  • FastAPI
  • LangChain
  • RAG
  • ChromaDB
  • Scrapy
  • PostgreSQL
  • CrewAI
  • Async architecture with Clean Architecture
  • ETL pipelines with data quality checks
  • Vector search & multi-agent workflows
  • Full test coverage & CI-ready
Repo

Client Projects

Real-world solutions delivered for clients across various industries. View my experience or see research work.

Property Data Scraper

Built comprehensive real estate scraping system for property management company to aggregate listings from multiple sources.

  • Python
  • Scrapy
  • MongoDB
  • Data Pipeline
  • 50K+ properties processed daily
  • 99.2% data accuracy rate
  • Multi-source aggregation

Analytics Dashboard

Developed real-time analytics dashboard for e-commerce client with interactive charts, KPI tracking, and automated reporting.

  • React
  • Node.js
  • PostgreSQL
  • Chart.js
  • Real-time data visualization
  • 15+ custom KPI metrics
  • Automated PDF reports

Market Research Scrapers

Built specialized scrapers for market research firm to collect competitor data, pricing information, and product catalogs.

  • Python
  • Selenium
  • BeautifulSoup
  • Redis
  • 10M+ data points collected
  • Anti-detection mechanisms
  • Scheduled data collection

Business Automation Suite

Developed workflow automation tools for logistics company to streamline inventory management, order processing, and reporting.

  • PHP
  • MySQL
  • Cron Jobs
  • API Integration
  • 80% reduction in manual tasks
  • Real-time inventory sync
  • Automated notifications

Travel Data Scraper

Built robust scraper for travel agency to monitor hotel prices, availability, and competitor rates from Booking.com and similar platforms.

  • Python
  • Playwright
  • Proxy Rotation
  • Rate Limiting
  • 500+ hotels monitored daily
  • Price change alerts
  • Multi-platform support

Services & approach

Clear scope. Reliable delivery. Clean hand‑offs. See my work or get in touch.

What I do

  • Web scraping and automation (robust, maintainable)
  • API and backend development (REST)
  • Fullstack websites
  • Database design and optimization
  • Deployments: VPS/cloud, Docker, CI/CD basics
  • Documentation and runbooks

I keep scope realistic so the result is stable and easy to maintain.

How I work

  • Discovery → plan → milestones
  • Build small, documented PRs
  • Instrumentation where it counts (logs, health checks)
  • Basic load testing before launch
  • Clean handover: docs and walkthrough

Minimum engagement: 1 week

Transparent communication and no surprises.

Experience

Freelance and teaching roles.

Freelancer / Contract Developer

2024 - Present

Building scrapers, APIs, and websites for clients.

  • Develop data scrapers for varied requirements
  • Debug and optimize existing codebases
  • Website development using modern web stacks

Teaching Assistant - University of Liberal Arts Bangladesh

Jul 2024 - Present

Assist professors with course materials and student guidance.

  • Help prepare materials and support students

Education

Where I’m learning by doing and studying.
University

University of Liberal Arts Bangladesh - BSc in CSE

Research Publications

Published academic research by MD. Jahidul Haque Junayer - IEEE conference proceedings and peer-reviewed publications.
IEEE Conference Paper - 2024

An IoT-Based Calculator for Body Mass Index Determination

2024 IEEE International Conference on Signal Processing, Information, Communication and Systems (SPICSCON), Khulna, Bangladesh, , pp. 1-4

DOI: 10.1109/SPICSCON64195.2024.10941347

Abstract: This research presents an innovative IoT-based system for automated Body Mass Index (BMI) calculation using advanced sensor technologies including load cells and ultrasonic sensors integrated with microcontroller systems.

  • IoT Systems
  • BMI Calculator
  • Load Cells
  • Ultrasonic Sensors
  • Microcontroller
  • Health Technology
  • IEEE Research
  • Signal Processing

Published in IEEE Xplore Digital Library | Citation available on Google Scholar

Let’s talk

Contact me with your ideas and requirements and I will get back to you soon.

Email
zenjahid@gmail.com

Response Time: 1 business day